Welcome to the first newsletter of the Interdisciplinary Thesis Lab Group: Circular Building Materials and (re)Manufacturing Hub! The Kick-off Meeting on the 9th of February made it official: for the upcoming half year we (TLBR: Karismi, José-Luis, Batuhan, Alex, Wenhui, Manon, Yajuan, Twan, Koert and Arjan) are the lucky ones that, together with a consortium of partners from practice, the Leiden Delft and Erasmus Universities Center for Sustainability (LDE CfS) and you, will be focussing on one of society’s most pressing urban challenges. With this newsletter, we want to introduce ourselves briefly, and reflect on the first two successful sessions that we enjoyed already. The complex and multidisciplinary nature of Circular Building Hubs demands a holistic approach. Therefore, our group consists of 10 students from 3 different universities and 4 different studies. With backgrounds in Industrial Ecology, Urban Governance, Management in Built Environment, and Applied Mathematics, each of us aims to unravel part of the mystery.